render_tests: use XGL_NUM_FMT_UNORM

With 8-bit per channel and UNORM, [0.0, 1.0] will be scaled to [0, 255].
diff --git a/tests/render_tests.cpp b/tests/render_tests.cpp
index b9cf4dc..edf98e4 100644
--- a/tests/render_tests.cpp
+++ b/tests/render_tests.cpp
@@ -211,7 +211,7 @@
     }
 
     fmt.channelFormat = XGL_CH_FMT_R8G8B8A8;
-    fmt.numericFormat = XGL_NUM_FMT_UINT;
+    fmt.numericFormat = XGL_NUM_FMT_UNORM;
     // TODO: Pick known good format rather than just expect common format
     /*
      * XXX: What should happen if given NULL HANDLE for the pData argument?
@@ -585,7 +585,7 @@
         {                                                   // XGL_PIPELINE_CB_ATTACHMENT_STATE
             {
                 XGL_FALSE,                                  // blendEnable
-                {XGL_CH_FMT_R8G8B8A8, XGL_NUM_FMT_UINT},    // XGL_FORMAT
+                {XGL_CH_FMT_R8G8B8A8, XGL_NUM_FMT_UNORM},   // XGL_FORMAT
                 0xF                                         // channelWriteMask
             }
         }
@@ -627,7 +627,7 @@
         XGL_STRUCTURE_TYPE_COLOR_ATTACHMENT_VIEW_CREATE_INFO,
         XGL_NULL_HANDLE,
         this->m_image,
-        {XGL_CH_FMT_R8G8B8A8, XGL_NUM_FMT_UINT},
+        {XGL_CH_FMT_R8G8B8A8, XGL_NUM_FMT_UNORM},
         0,
         0,
         1